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<h1>Source code for pyFTS.partitioners.Huarng</h1><div class="highlight"><pre>
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<span></span><span class="sd">"""</span>
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<span class="sd">K. H. Huarng, “Effective lengths of intervals to improve forecasting in fuzzy time series,”</span>
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<span class="sd">Fuzzy Sets Syst., vol. 123, no. 3, pp. 387–394, Nov. 2001.</span>
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<span class="sd">"""</span>
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<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
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<span class="kn">import</span> <span class="nn">math</span>
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<span class="kn">import</span> <span class="nn">random</span> <span class="k">as</span> <span class="nn">rnd</span>
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<span class="kn">import</span> <span class="nn">functools</span><span class="o">,</span> <span class="nn">operator</span>
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<span class="kn">from</span> <span class="nn">pyFTS.common</span> <span class="k">import</span> <span class="n">FuzzySet</span><span class="p">,</span> <span class="n">Membership</span><span class="p">,</span> <span class="n">Transformations</span>
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<span class="kn">from</span> <span class="nn">pyFTS.partitioners</span> <span class="k">import</span> <span class="n">partitioner</span>
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<div class="viewcode-block" id="HuarngPartitioner"><a class="viewcode-back" href="../../../pyFTS.partitioners.html#pyFTS.partitioners.Huarng.HuarngPartitioner">[docs]</a><span class="k">class</span> <span class="nc">HuarngPartitioner</span><span class="p">(</span><span class="n">partitioner</span><span class="o">.</span><span class="n">Partitioner</span><span class="p">):</span>
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<span class="sd">"""Huarng Empirical Partitioner"""</span>
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<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
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<span class="nb">super</span><span class="p">(</span><span class="n">HuarngPartitioner</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s2">"Huarng"</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
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<div class="viewcode-block" id="HuarngPartitioner.build"><a class="viewcode-back" href="../../../pyFTS.partitioners.html#pyFTS.partitioners.Huarng.HuarngPartitioner.build">[docs]</a> <span class="k">def</span> <span class="nf">build</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
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<span class="n">diff</span> <span class="o">=</span> <span class="n">Transformations</span><span class="o">.</span><span class="n">Differential</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
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<span class="n">data2</span> <span class="o">=</span> <span class="n">diff</span><span class="o">.</span><span class="n">apply</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
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<span class="n">davg</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">abs</span><span class="p">(</span> <span class="n">np</span><span class="o">.</span><span class="n">mean</span><span class="p">(</span><span class="n">data2</span><span class="p">)</span> <span class="o">/</span> <span class="mi">2</span> <span class="p">)</span>
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<span class="k">if</span> <span class="n">davg</span> <span class="o"><=</span> <span class="mf">1.0</span><span class="p">:</span>
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<span class="n">base</span> <span class="o">=</span> <span class="mf">0.1</span>
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<span class="k">elif</span> <span class="mi">1</span> <span class="o"><</span> <span class="n">davg</span> <span class="o"><=</span> <span class="mi">10</span><span class="p">:</span>
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<span class="n">base</span> <span class="o">=</span> <span class="mf">1.0</span>
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<span class="k">elif</span> <span class="mi">10</span> <span class="o"><</span> <span class="n">davg</span> <span class="o"><=</span> <span class="mi">100</span><span class="p">:</span>
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<span class="n">base</span> <span class="o">=</span> <span class="mi">10</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="n">base</span> <span class="o">=</span> <span class="mi">100</span>
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<span class="n">sets</span> <span class="o">=</span> <span class="p">{}</span>
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<span class="n">dlen</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">max</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">min</span>
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<span class="n">npart</span> <span class="o">=</span> <span class="n">math</span><span class="o">.</span><span class="n">ceil</span><span class="p">(</span><span class="n">dlen</span> <span class="o">/</span> <span class="n">base</span><span class="p">)</span>
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<span class="n">partition</span> <span class="o">=</span> <span class="n">math</span><span class="o">.</span><span class="n">ceil</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">min</span><span class="p">)</span>
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<span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">npart</span><span class="p">):</span>
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<span class="n">_name</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_name</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
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<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">membership_function</span> <span class="o">==</span> <span class="n">Membership</span><span class="o">.</span><span class="n">trimf</span><span class="p">:</span>
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<span class="n">sets</span><span class="p">[</span><span class="n">_name</span><span class="p">]</span> <span class="o">=</span> <span class="n">FuzzySet</span><span class="o">.</span><span class="n">FuzzySet</span><span class="p">(</span><span class="n">_name</span><span class="p">,</span> <span class="n">Membership</span><span class="o">.</span><span class="n">trimf</span><span class="p">,</span>
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<span class="p">[</span><span class="n">partition</span> <span class="o">-</span> <span class="n">base</span><span class="p">,</span> <span class="n">partition</span><span class="p">,</span> <span class="n">partition</span> <span class="o">+</span> <span class="n">base</span><span class="p">],</span> <span class="n">partition</span><span class="p">)</span>
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<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">membership_function</span> <span class="o">==</span> <span class="n">Membership</span><span class="o">.</span><span class="n">gaussmf</span><span class="p">:</span>
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<span class="n">sets</span><span class="p">[</span><span class="n">_name</span><span class="p">]</span> <span class="o">=</span> <span class="n">FuzzySet</span><span class="o">.</span><span class="n">FuzzySet</span><span class="p">(</span><span class="n">_name</span><span class="p">,</span> <span class="n">Membership</span><span class="o">.</span><span class="n">gaussmf</span><span class="p">,</span>
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<span class="p">[</span><span class="n">partition</span><span class="p">,</span> <span class="n">base</span><span class="o">/</span><span class="mi">2</span><span class="p">],</span> <span class="n">partition</span><span class="p">)</span>
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<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">membership_function</span> <span class="o">==</span> <span class="n">Membership</span><span class="o">.</span><span class="n">trapmf</span><span class="p">:</span>
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<span class="n">sets</span><span class="p">[</span><span class="n">_name</span><span class="p">]</span> <span class="o">=</span> <span class="n">FuzzySet</span><span class="o">.</span><span class="n">FuzzySet</span><span class="p">(</span><span class="n">_name</span><span class="p">,</span> <span class="n">Membership</span><span class="o">.</span><span class="n">trapmf</span><span class="p">,</span>
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<span class="p">[</span><span class="n">partition</span> <span class="o">-</span> <span class="n">base</span><span class="p">,</span> <span class="n">partition</span> <span class="o">-</span> <span class="p">(</span><span class="n">base</span><span class="o">/</span><span class="mi">2</span><span class="p">),</span>
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<span class="n">partition</span> <span class="o">+</span> <span class="p">(</span><span class="n">base</span> <span class="o">/</span> <span class="mi">2</span><span class="p">),</span> <span class="n">partition</span> <span class="o">+</span> <span class="n">base</span><span class="p">],</span> <span class="n">partition</span><span class="p">)</span>
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<span class="n">partition</span> <span class="o">+=</span> <span class="n">base</span>
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<span class="k">return</span> <span class="n">sets</span></div></div>
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</pre></div>
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